1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * include/linux/irqflags.h 3 * include/linux/irqflags.h
4 * 4 *
5 * IRQ flags tracing: follow the state of the 5 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
6 * provide callbacks for transitions between O 6 * provide callbacks for transitions between ON and OFF states.
7 * 7 *
8 * This file gets included from lowlevel asm h 8 * This file gets included from lowlevel asm headers too, to provide
9 * wrapped versions of the local_irq_*() APIs, 9 * wrapped versions of the local_irq_*() APIs, based on the
10 * raw_local_irq_*() macros from the lowlevel 10 * raw_local_irq_*() macros from the lowlevel headers.
11 */ 11 */
12 #ifndef _LINUX_TRACE_IRQFLAGS_H 12 #ifndef _LINUX_TRACE_IRQFLAGS_H
13 #define _LINUX_TRACE_IRQFLAGS_H 13 #define _LINUX_TRACE_IRQFLAGS_H
14 14
15 #include <linux/irqflags_types.h> <<
16 #include <linux/typecheck.h> 15 #include <linux/typecheck.h>
17 #include <linux/cleanup.h> <<
18 #include <asm/irqflags.h> 16 #include <asm/irqflags.h>
19 #include <asm/percpu.h> 17 #include <asm/percpu.h>
20 18
21 /* Currently lockdep_softirqs_on/off is used o 19 /* Currently lockdep_softirqs_on/off is used only by lockdep */
22 #ifdef CONFIG_PROVE_LOCKING 20 #ifdef CONFIG_PROVE_LOCKING
23 extern void lockdep_softirqs_on(unsigned lon 21 extern void lockdep_softirqs_on(unsigned long ip);
24 extern void lockdep_softirqs_off(unsigned lo 22 extern void lockdep_softirqs_off(unsigned long ip);
25 extern void lockdep_hardirqs_on_prepare(void !! 23 extern void lockdep_hardirqs_on_prepare(unsigned long ip);
26 extern void lockdep_hardirqs_on(unsigned lon 24 extern void lockdep_hardirqs_on(unsigned long ip);
27 extern void lockdep_hardirqs_off(unsigned lo 25 extern void lockdep_hardirqs_off(unsigned long ip);
28 #else 26 #else
29 static inline void lockdep_softirqs_on(unsig 27 static inline void lockdep_softirqs_on(unsigned long ip) { }
30 static inline void lockdep_softirqs_off(unsi 28 static inline void lockdep_softirqs_off(unsigned long ip) { }
31 static inline void lockdep_hardirqs_on_prepa !! 29 static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { }
32 static inline void lockdep_hardirqs_on(unsig 30 static inline void lockdep_hardirqs_on(unsigned long ip) { }
33 static inline void lockdep_hardirqs_off(unsi 31 static inline void lockdep_hardirqs_off(unsigned long ip) { }
34 #endif 32 #endif
35 33
36 #ifdef CONFIG_TRACE_IRQFLAGS 34 #ifdef CONFIG_TRACE_IRQFLAGS
37 35
>> 36 /* Per-task IRQ trace events information. */
>> 37 struct irqtrace_events {
>> 38 unsigned int irq_events;
>> 39 unsigned long hardirq_enable_ip;
>> 40 unsigned long hardirq_disable_ip;
>> 41 unsigned int hardirq_enable_event;
>> 42 unsigned int hardirq_disable_event;
>> 43 unsigned long softirq_disable_ip;
>> 44 unsigned long softirq_enable_ip;
>> 45 unsigned int softirq_disable_event;
>> 46 unsigned int softirq_enable_event;
>> 47 };
>> 48
38 DECLARE_PER_CPU(int, hardirqs_enabled); 49 DECLARE_PER_CPU(int, hardirqs_enabled);
39 DECLARE_PER_CPU(int, hardirq_context); 50 DECLARE_PER_CPU(int, hardirq_context);
40 51
41 extern void trace_hardirqs_on_prepare(void); 52 extern void trace_hardirqs_on_prepare(void);
42 extern void trace_hardirqs_off_finish(void); 53 extern void trace_hardirqs_off_finish(void);
43 extern void trace_hardirqs_on(void); 54 extern void trace_hardirqs_on(void);
44 extern void trace_hardirqs_off(void); 55 extern void trace_hardirqs_off(void);
45 56
46 # define lockdep_hardirq_context() (raw_c 57 # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context))
47 # define lockdep_softirq_context(p) ((p)-> 58 # define lockdep_softirq_context(p) ((p)->softirq_context)
48 # define lockdep_hardirqs_enabled() (this_ 59 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
49 # define lockdep_softirqs_enabled(p) ((p)-> 60 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
50 # define lockdep_hardirq_enter() 61 # define lockdep_hardirq_enter() \
51 do { 62 do { \
52 if (__this_cpu_inc_return(hardirq_cont 63 if (__this_cpu_inc_return(hardirq_context) == 1)\
53 current->hardirq_threaded = 0; 64 current->hardirq_threaded = 0; \
54 } while (0) 65 } while (0)
55 # define lockdep_hardirq_threaded() 66 # define lockdep_hardirq_threaded() \
56 do { 67 do { \
57 current->hardirq_threaded = 1; 68 current->hardirq_threaded = 1; \
58 } while (0) 69 } while (0)
59 # define lockdep_hardirq_exit() 70 # define lockdep_hardirq_exit() \
60 do { 71 do { \
61 __this_cpu_dec(hardirq_context); 72 __this_cpu_dec(hardirq_context); \
62 } while (0) 73 } while (0)
>> 74 # define lockdep_softirq_enter() \
>> 75 do { \
>> 76 current->softirq_context++; \
>> 77 } while (0)
>> 78 # define lockdep_softirq_exit() \
>> 79 do { \
>> 80 current->softirq_context--; \
>> 81 } while (0)
63 82
64 # define lockdep_hrtimer_enter(__hrtimer) 83 # define lockdep_hrtimer_enter(__hrtimer) \
65 ({ 84 ({ \
66 bool __expires_hardirq = true; 85 bool __expires_hardirq = true; \
67 86 \
68 if (!__hrtimer->is_hard) { 87 if (!__hrtimer->is_hard) { \
69 current->irq_config = 1; 88 current->irq_config = 1; \
70 __expires_hardirq = false; 89 __expires_hardirq = false; \
71 } 90 } \
72 __expires_hardirq; 91 __expires_hardirq; \
73 }) 92 })
74 93
75 # define lockdep_hrtimer_exit(__expires_hardir 94 # define lockdep_hrtimer_exit(__expires_hardirq) \
76 do { 95 do { \
77 if (!__expires_hardirq) 96 if (!__expires_hardirq) \
78 current->irq_config = 97 current->irq_config = 0; \
79 } while (0) 98 } while (0)
80 99
81 # define lockdep_posixtimer_enter() 100 # define lockdep_posixtimer_enter() \
82 do { 101 do { \
83 current->irq_config = 1; 102 current->irq_config = 1; \
84 } while (0) 103 } while (0)
85 104
86 # define lockdep_posixtimer_exit() 105 # define lockdep_posixtimer_exit() \
87 do { 106 do { \
88 current->irq_config = 0; 107 current->irq_config = 0; \
89 } while (0) 108 } while (0)
90 109
91 # define lockdep_irq_work_enter(_flags) !! 110 # define lockdep_irq_work_enter(__work) \
92 do { 111 do { \
93 if (!((_flags) & IRQ_WORK_HA !! 112 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
94 current->irq_config = 113 current->irq_config = 1; \
95 } while (0) 114 } while (0)
96 # define lockdep_irq_work_exit(_flags) !! 115 # define lockdep_irq_work_exit(__work) \
97 do { 116 do { \
98 if (!((_flags) & IRQ_WORK_HA !! 117 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
99 current->irq_config = 118 current->irq_config = 0; \
100 } while (0) 119 } while (0)
101 120
102 #else 121 #else
103 # define trace_hardirqs_on_prepare() 122 # define trace_hardirqs_on_prepare() do { } while (0)
104 # define trace_hardirqs_off_finish() 123 # define trace_hardirqs_off_finish() do { } while (0)
105 # define trace_hardirqs_on() 124 # define trace_hardirqs_on() do { } while (0)
106 # define trace_hardirqs_off() 125 # define trace_hardirqs_off() do { } while (0)
107 # define lockdep_hardirq_context() 126 # define lockdep_hardirq_context() 0
108 # define lockdep_softirq_context(p) 127 # define lockdep_softirq_context(p) 0
109 # define lockdep_hardirqs_enabled() 128 # define lockdep_hardirqs_enabled() 0
110 # define lockdep_softirqs_enabled(p) 129 # define lockdep_softirqs_enabled(p) 0
111 # define lockdep_hardirq_enter() 130 # define lockdep_hardirq_enter() do { } while (0)
112 # define lockdep_hardirq_threaded() 131 # define lockdep_hardirq_threaded() do { } while (0)
113 # define lockdep_hardirq_exit() 132 # define lockdep_hardirq_exit() do { } while (0)
114 # define lockdep_softirq_enter() 133 # define lockdep_softirq_enter() do { } while (0)
115 # define lockdep_softirq_exit() 134 # define lockdep_softirq_exit() do { } while (0)
116 # define lockdep_hrtimer_enter(__hrtimer) 135 # define lockdep_hrtimer_enter(__hrtimer) false
117 # define lockdep_hrtimer_exit(__context) !! 136 # define lockdep_hrtimer_exit(__context) do { } while (0)
118 # define lockdep_posixtimer_enter() 137 # define lockdep_posixtimer_enter() do { } while (0)
119 # define lockdep_posixtimer_exit() 138 # define lockdep_posixtimer_exit() do { } while (0)
120 # define lockdep_irq_work_enter(__work) 139 # define lockdep_irq_work_enter(__work) do { } while (0)
121 # define lockdep_irq_work_exit(__work) 140 # define lockdep_irq_work_exit(__work) do { } while (0)
122 #endif 141 #endif
123 142
124 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined <<
125 # define lockdep_softirq_enter() <<
126 do { <<
127 current->softirq_context++; <<
128 } while (0) <<
129 # define lockdep_softirq_exit() <<
130 do { <<
131 current->softirq_context--; <<
132 } while (0) <<
133 <<
134 #else <<
135 # define lockdep_softirq_enter() <<
136 # define lockdep_softirq_exit() <<
137 #endif <<
138 <<
139 #if defined(CONFIG_IRQSOFF_TRACER) || \ 143 #if defined(CONFIG_IRQSOFF_TRACER) || \
140 defined(CONFIG_PREEMPT_TRACER) 144 defined(CONFIG_PREEMPT_TRACER)
141 extern void stop_critical_timings(void); 145 extern void stop_critical_timings(void);
142 extern void start_critical_timings(void); 146 extern void start_critical_timings(void);
143 #else 147 #else
144 # define stop_critical_timings() do { } while 148 # define stop_critical_timings() do { } while (0)
145 # define start_critical_timings() do { } while 149 # define start_critical_timings() do { } while (0)
146 #endif 150 #endif
147 151
148 #ifdef CONFIG_DEBUG_IRQFLAGS <<
149 extern void warn_bogus_irq_restore(void); <<
150 #define raw_check_bogus_irq_restore() <<
151 do { <<
152 if (unlikely(!arch_irqs_disabl <<
153 warn_bogus_irq_restore <<
154 } while (0) <<
155 #else <<
156 #define raw_check_bogus_irq_restore() do { } w <<
157 #endif <<
158 <<
159 /* 152 /*
160 * Wrap the arch provided IRQ routines to prov 153 * Wrap the arch provided IRQ routines to provide appropriate checks.
161 */ 154 */
162 #define raw_local_irq_disable() arch_l 155 #define raw_local_irq_disable() arch_local_irq_disable()
163 #define raw_local_irq_enable() arch_l 156 #define raw_local_irq_enable() arch_local_irq_enable()
164 #define raw_local_irq_save(flags) 157 #define raw_local_irq_save(flags) \
165 do { 158 do { \
166 typecheck(unsigned long, flags 159 typecheck(unsigned long, flags); \
167 flags = arch_local_irq_save(); 160 flags = arch_local_irq_save(); \
168 } while (0) 161 } while (0)
169 #define raw_local_irq_restore(flags) 162 #define raw_local_irq_restore(flags) \
170 do { 163 do { \
171 typecheck(unsigned long, flags 164 typecheck(unsigned long, flags); \
172 raw_check_bogus_irq_restore(); <<
173 arch_local_irq_restore(flags); 165 arch_local_irq_restore(flags); \
174 } while (0) 166 } while (0)
175 #define raw_local_save_flags(flags) 167 #define raw_local_save_flags(flags) \
176 do { 168 do { \
177 typecheck(unsigned long, flags 169 typecheck(unsigned long, flags); \
178 flags = arch_local_save_flags( 170 flags = arch_local_save_flags(); \
179 } while (0) 171 } while (0)
180 #define raw_irqs_disabled_flags(flags) 172 #define raw_irqs_disabled_flags(flags) \
181 ({ 173 ({ \
182 typecheck(unsigned long, flags 174 typecheck(unsigned long, flags); \
183 arch_irqs_disabled_flags(flags 175 arch_irqs_disabled_flags(flags); \
184 }) 176 })
185 #define raw_irqs_disabled() (arch_ 177 #define raw_irqs_disabled() (arch_irqs_disabled())
186 #define raw_safe_halt() arch_s 178 #define raw_safe_halt() arch_safe_halt()
187 179
188 /* 180 /*
189 * The local_irq_*() APIs are equal to the raw 181 * The local_irq_*() APIs are equal to the raw_local_irq*()
190 * if !TRACE_IRQFLAGS. 182 * if !TRACE_IRQFLAGS.
191 */ 183 */
192 #ifdef CONFIG_TRACE_IRQFLAGS 184 #ifdef CONFIG_TRACE_IRQFLAGS
193 185
194 #define local_irq_enable() 186 #define local_irq_enable() \
195 do { 187 do { \
196 trace_hardirqs_on(); 188 trace_hardirqs_on(); \
197 raw_local_irq_enable(); 189 raw_local_irq_enable(); \
198 } while (0) 190 } while (0)
199 191
200 #define local_irq_disable() 192 #define local_irq_disable() \
201 do { 193 do { \
202 bool was_disabled = raw_irqs_d 194 bool was_disabled = raw_irqs_disabled();\
203 raw_local_irq_disable(); 195 raw_local_irq_disable(); \
204 if (!was_disabled) 196 if (!was_disabled) \
205 trace_hardirqs_off(); 197 trace_hardirqs_off(); \
206 } while (0) 198 } while (0)
207 199
208 #define local_irq_save(flags) 200 #define local_irq_save(flags) \
209 do { 201 do { \
210 raw_local_irq_save(flags); 202 raw_local_irq_save(flags); \
211 if (!raw_irqs_disabled_flags(f 203 if (!raw_irqs_disabled_flags(flags)) \
212 trace_hardirqs_off(); 204 trace_hardirqs_off(); \
213 } while (0) 205 } while (0)
214 206
215 #define local_irq_restore(flags) 207 #define local_irq_restore(flags) \
216 do { 208 do { \
217 if (!raw_irqs_disabled_flags(f 209 if (!raw_irqs_disabled_flags(flags)) \
218 trace_hardirqs_on(); 210 trace_hardirqs_on(); \
219 raw_local_irq_restore(flags); 211 raw_local_irq_restore(flags); \
220 } while (0) 212 } while (0)
221 213
222 #define safe_halt() 214 #define safe_halt() \
223 do { 215 do { \
224 trace_hardirqs_on(); 216 trace_hardirqs_on(); \
225 raw_safe_halt(); 217 raw_safe_halt(); \
226 } while (0) 218 } while (0)
227 219
228 220
229 #else /* !CONFIG_TRACE_IRQFLAGS */ 221 #else /* !CONFIG_TRACE_IRQFLAGS */
230 222
231 #define local_irq_enable() do { raw_local 223 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
232 #define local_irq_disable() do { raw_local 224 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
233 #define local_irq_save(flags) do { raw_local 225 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0)
234 #define local_irq_restore(flags) do { raw_loca 226 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
235 #define safe_halt() do { raw_safe_ 227 #define safe_halt() do { raw_safe_halt(); } while (0)
236 228
237 #endif /* CONFIG_TRACE_IRQFLAGS */ 229 #endif /* CONFIG_TRACE_IRQFLAGS */
238 230
239 #define local_save_flags(flags) raw_local_save 231 #define local_save_flags(flags) raw_local_save_flags(flags)
240 232
241 /* 233 /*
242 * Some architectures don't define arch_irqs_d 234 * Some architectures don't define arch_irqs_disabled(), so even if either
243 * definition would be fine we need to use dif 235 * definition would be fine we need to use different ones for the time being
244 * to avoid build issues. 236 * to avoid build issues.
245 */ 237 */
246 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 238 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
247 #define irqs_disabled() 239 #define irqs_disabled() \
248 ({ 240 ({ \
249 unsigned long _flags; 241 unsigned long _flags; \
250 raw_local_save_flags(_flags); 242 raw_local_save_flags(_flags); \
251 raw_irqs_disabled_flags(_flags 243 raw_irqs_disabled_flags(_flags); \
252 }) 244 })
253 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 245 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
254 #define irqs_disabled() raw_irqs_disabled() 246 #define irqs_disabled() raw_irqs_disabled()
255 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 247 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
256 248
257 #define irqs_disabled_flags(flags) raw_irqs_di 249 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
258 <<
259 DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), <<
260 DEFINE_LOCK_GUARD_0(irqsave, <<
261 local_irq_save(_T->flags), <<
262 local_irq_restore(_T->flag <<
263 unsigned long flags) <<
264 250
265 #endif 251 #endif
266 252
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